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Turbulence Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence Heat and Mass Transfer
September, 14-18, 2009, Rome, Italy

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf


ISBN Print: 978-1-56700-262-1

ISSN: 2377-2816

Hybrid RANS/PDF calculations of a swirling bluff body flame (‘SM1’)

page 12
DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.450
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摘要

Steady 2D axisymmetric RANS and hybrid RANS/PDF calculations are performed to predict the turbulent flow and mixing fields of a swirling bluff body stabilized flame ('SM1'), studied experimentally at Sydney University and Sandia National Laboratories. Turbulence is modeled with a non-linear k-ε type model, taking into account effects of rotation and streamline curvature on turbulence. Flow field predictions are in reasonable agreement with experimental data. However, the agreement for mean mixture fraction and mixture fraction variance with experimental results is less satisfactory. The influence of the chemistry model, i.e. the use of a single laminar flamelet or the REDIM approach, is studied in transported PDF calculations with the EMST micro-mixing model. The amount of scatter is limited and observed differences are small. The combination REDIM/EMST does not reproduce the local extinction seen in the experiments. The direct comparison with the coalescence/dispersion (CD) mixing model could not be done with the same model parameter settings, as the flame extinguishes when using the REDIM approach together with the CD mixing model. Therefore, a final calculation with CD is performed with an increased value Cφ=3 and a steady solution is found. There is more scatter than with EMST, resulting in lower values for temperature and Y(CO2). Still, with the combination REDIM/CD, the level of local extinction is still under-estimated.

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